Strip electrode for overlay welding

Abstract

There is disclosed an electrode for overlay welding made up of laminations. All of the laminations are composited to be hot workable; and they may be austenitic stainless steel, ferritic stainless steel, duplex structures that are hot workable, or pure metals such as chromium. The combined composition of all laminations, when they are melted and resolidified, will contain at least 2%w of delta ferrite.

What is claimed is: 
     
       1. An electrode for overlay welding which comprises a plurality of laminations including at least a first lamination of austenitic stainless steel and at least one other lamination being composited such that when said electrode melts and resolidifies, the resolidified metal will contain at least 2%w delta ferrite. 
     
     
       2. The electrode of claim 1 wherein said resolidified metal will contain at least 5%w delta ferrite. 
     
     
       3. The electrode of claim 1 in the form of a flat strip. 
     
     
       4. The electrode of claim 1 with a round cross section. 
     
     
       5. The electrode of claim 1 wherein said other lamination comprises an iron alloy that is at least 50%w delta ferrite. 
     
     
       6. The electrode of claim 1 wherein said other lamination comprises at least 15% chromium, at least 1.0% manganese, and not more than 1.0% nickel. 
     
     
       7. The electrode of claim 1 wherein said other lamination is chromium. 
     
     
       8. The electrode of claim 1 in the form of a flat strip and comprising three laminations with the outer laminations being the same alloy. 
     
     
       9. The electrode of claim 1 wherein said austenitic stainless steel alloy is type 304 stainless steel, and said other lamination comprises 12% nickel, 34% chromium, 0.7% manganese, and the balance iron and residuals. 
     
     
       10. The electrode of claim 1 wherein said austenitic alloys is type 310 stainless steel, and said other alloy comprises 20% chromium, 1.5% manganese, and the balance iron and residuals.